The Rule of 2 and 4
"The majority of players are looking for reasons to fold. I am looking for reasons to play." ~ Daniel Negreanu
The Rule of 2 and 4 are quick shortcuts to help us work out the percentage needed to get a draw in Texas No-Limit Hold'em. These shortcuts aren’t exact. However, they are good enough for doing quick probabilities in our head at the tables.
The Rule of 2
The Rule of 2 states: Multiply your number of outs by 2 to get the approximate percentage of a draw you have on the turn or the river.
For example, let's say you have a flush draw after the flop.
The Rule of 2 works because there are 52 cards in the deck
and 52 goes into one hundred approximately twice.
The Rule of 4
The Rule of 4 is used when you are considering an all-in move after the flop and will see both the turn and river cards. Multiply your number of outs by 4 to get the approximate percentage of a draw.
Like the Rule of 2 example, you have a flush draw after the flop.
Once again, that’s close and useful for quick estimate at the tables.
Note: The Core Math Chapter of Mastering Poker Math provides more detail on how this equation is derived.
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